import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:flutter_swiper_view/flutter_swiper_view.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
import '../../../services/app_colors.dart';
import '../../../services/app_fontIcons.dart';
import '../../../services/app_keepAliveWrapper.dart';
import '../../../services/app_network.dart';
import '../../../services/app_screenAdapter.dart';
import '../controllers/home_controller.dart';

class HomeView extends GetView<HomeController> {
  const HomeView({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return KeepAliveWrapper(
      child: Scaffold(
          backgroundColor: DoColors.gray249,
          // backgroundColor: Colors.cyan,
          body: Stack(
            children: [
              _contentListView(),
              _customAppBar(),
            ],
          )),
    );
  }

  ///自定义的appBar
  Widget _customAppBar() {
    return Positioned(
        left: 0,
        top: 0,
        right: 0,
        child: Obx(
              () => AppBar(
            centerTitle: true,
            backgroundColor: Color.fromRGBO(255, 255, 255,
                controller.ratio.value), //Colors.transparent=白色透明度为0
            elevation: 0,
            leading: IconButton(
                onPressed: () {},
                icon: Icon(
                  DoFontIcons.xiaomi,
                  color:
                  Color.fromRGBO(255, 255, 255, 1 - controller.ratio.value),
                )),
            leadingWidth: controller.flag.value ? 0 : 50,
            actions: [
              IconButton(
                  onPressed: () {},
                  icon: Icon(
                    Icons.qr_code,
                    color:
                    controller.flag.value ? Colors.black87 : Colors.white,
                  )),
              IconButton(
                  onPressed: () {},
                  icon: Icon(
                    DoFontIcons.message,
                    color:
                    controller.flag.value ? Colors.black87 : Colors.white,
                  )),
            ],
            title: InkWell(
              onTap: () {
                Get.toNamed("/search");
              },
              child: AnimatedContainer(
                duration: const Duration(milliseconds: 500),
                padding: const EdgeInsets.symmetric(horizontal: 10),
                width: DoScreenAdapter.w(200 + controller.ratio.value * 50),
                height: DoScreenAdapter.h(26),
                decoration: BoxDecoration(
                  color: const Color.fromRGBO(246, 246, 246, 1),
                  borderRadius: BorderRadius.circular(30),
                ),
                child: Row(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Row(
                      children: [
                        const Icon(
                          Icons.search,
                          color: Colors.black26,
                          size: 20,
                        ),
                        SizedBox(
                          width: DoScreenAdapter.w(5),
                        ),
                        Text(
                          "搜索",
                          style: TextStyle(
                            fontSize: DoScreenAdapter.fs(14),
                            color: Colors.black45,
                          ),
                        ),
                      ],
                    ),
                    InkWell(
                      onTap: () {
                        print("scan");
                        controller.openScan();
                      },
                      child: const Icon(
                        DoFontIcons.scan,
                        color: Colors.black26,
                        size: 20,
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        ));
  }

  ///listView的内容区域
  Widget _contentListView() {
    return Positioned(
        top: -DoScreenAdapter.h(0),
        left: 0,
        right: 0,
        bottom: 0,
        child: SmartRefresher(
          enablePullDown: true,
          // enablePullUp: true,
          // enableTwoLevel: true,
          controller: controller.refreshController,
          onRefresh: controller.onRefresh,
          // onLoading: controller.onLoad,
          // onTwoLevel: (isOpen) {},
          // header: ClassicFooter(),
          header: const WaterDropMaterialHeader(
            color: Colors.white,
            backgroundColor: DoColors.theme,
          ),
          // footer: ClassicFooter(),
          child: ListView(controller: controller.scrollController, children: [
            _bannerSwiperSection(),
            _bannerImageSection(),
            _menuSwiperSection(),
            _sigleBannerSection(),
            _bestGoodsSection(),
            _goodsListView(),
          ]),
        ));
  }

  ///顶部banner
  Widget _bannerSwiperSection() {
    return Container(
      color: Colors.white,
      width: DoScreenAdapter.w(375),
      height: DoScreenAdapter.h(200),
      child: Obx(
            () => Swiper(
          autoplay: true,
          loop: true,
          itemCount: controller.bannerList.length,
          // pagination: const SwiperPagination(builder: SwiperPagination.rect),
          pagination: SwiperPagination(
              margin: const EdgeInsets.all(0.0),
              builder: SwiperCustomPagination(
                  builder: (BuildContext context, SwiperPluginConfig config) {
                    return ConstrainedBox(
                      constraints: BoxConstraints.expand(
                          height: DoScreenAdapter.h(15)), //隔底部的间距
                      child: Row(
                        children: <Widget>[
                          Expanded(
                            child: Align(
                              alignment: Alignment.center,
                              child: const RectSwiperPaginationBuilder(
                                color: Colors.black12,
                                activeColor: Colors.white,
                              ).build(context, config),
                            ),
                          )
                        ],
                      ),
                    );
                  })),
          itemBuilder: (context, index) {
            return Image.network(
              DoNetwork.replacePictureURL(controller.bannerList[index].pic!),
              fit: BoxFit.fill,
            );
          },
        ),
      ),
    );
  }

  ///固定banner图片
  Widget _bannerImageSection() {
    return SizedBox(
      width: DoScreenAdapter.screenW(),
      height: DoScreenAdapter.h(20),
      child: Image.asset(
        "assets/images/xiaomiMenu.png",
        fit: BoxFit.cover,
      ),
    );
  }

  ///菜单滚动区
  Widget _menuSwiperSection() {
    return Container(
      color: Colors.white,
      width: DoScreenAdapter.w(375),
      height: DoScreenAdapter.h(160),
      child: Obx(
            () => Swiper(
          pagination: SwiperPagination(
              margin: const EdgeInsets.all(0.0),
              builder: SwiperCustomPagination(
                  builder: (BuildContext context, SwiperPluginConfig config) {
                    return ConstrainedBox(
                      constraints: BoxConstraints.expand(
                          height: DoScreenAdapter.h(15)), //底部的间距
                      child: Row(
                        children: <Widget>[
                          Expanded(
                            child: Align(
                              alignment: Alignment.center,
                              child: const RectSwiperPaginationBuilder(
                                color: Colors.black12,
                                activeColor: Colors.black54,
                              ).build(context, config),
                            ),
                          )
                        ],
                      ),
                    );
                  })),
          loop: false,
          itemCount: controller.categoryList.length ~/ 10, //取整
          itemBuilder: (context, index) {
            return GridView.builder(
              physics: const NeverScrollableScrollPhysics(),
              padding: EdgeInsets.all(DoScreenAdapter.w(10)),
              itemCount: 10, //代表一屏最多显示几个
              gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                  crossAxisCount: 5,
                  crossAxisSpacing: DoScreenAdapter.w(25), //水平间距
                  mainAxisSpacing: DoScreenAdapter.h(5), //垂直间距
                  childAspectRatio:
                  0.6 //！！！！这个非常重要，默认是1，也就是item整体是宽高比1：1，感觉优先级比较高，
                //下面单独设置的图片container的宽高都不生效, 这个值调高一些，就会出现bottom overflowed by 26 PIXELS的报错
              ),
              itemBuilder: (context, i) {
                return Column(
                  children: [
                    Container(
                      // padding: EdgeInsets.all(5),
                      // color: DoColors.theme,
                      alignment: Alignment.center,
                      //下面两个完全可以不设置，因为上面有个ratio生效
                      // width: DoScreenAdapter.h(60),
                      // height: DoScreenAdapter.h(60),
                      child: Image.network(
                        // color: Colors.green,
                        DoNetwork.replacePictureURL(
                            controller.categoryList[i + 10 * index].pic!),
                        fit: BoxFit.fitHeight,
                      ),
                    ),
                    SizedBox(
                      height: DoScreenAdapter.h(8),
                    ),
                    Text(
                      "${controller.categoryList[i + 10 * index].title}",
                      style: TextStyle(fontSize: DoScreenAdapter.fs(12)),
                    ),
                  ],
                );
              },
            );
          },
        ),
      ),
    );
  }

  ///单一banner区域
  Widget _sigleBannerSection() {
    return Container(
      color: Colors.white,
      padding: EdgeInsets.all(DoScreenAdapter.w(10)),
      child: Container(
        height: DoScreenAdapter.h(120),
        decoration: BoxDecoration(
          // color: DoColors.theme,
            borderRadius: BorderRadius.circular(DoScreenAdapter.w(10)),
            image: const DecorationImage(
              image: AssetImage("assets/images/xiaomiBanner.png"),
              fit: BoxFit.cover,
            )),
      ),
    );
  }

  ///热销臻选区域
  Widget _bestGoodsSection() {
    return Column(
      children: [
        Container(
          color: Colors.white,
          padding: EdgeInsets.all(DoScreenAdapter.w(10)),
          child: const Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Text(
                "热销臻选",
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
              ),
              Text(
                "更多手机推荐 ＞",
                style: TextStyle(
                    fontSize: 12,
                    // fontWeight: FontWeight.bold,
                    color: Colors.black38),
              ),
            ],
          ),
        ),
        Container(
          color: Colors.white,
          height: DoScreenAdapter.h(200),
          padding: EdgeInsets.fromLTRB(DoScreenAdapter.w(10), 0,
              DoScreenAdapter.w(10), DoScreenAdapter.w(10)),
          child: Row(
            children: [
              //左侧
              Expanded(
                flex: 1,
                child: Container(
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(DoScreenAdapter.w(30)),
                    color: DoColors.gray249,
                  ),
                  child: Obx(
                        () => Swiper(
                      autoplay: true,
                      loop: true,
                      itemCount: controller.bestBannerList.length,
                      pagination: SwiperPagination(
                          margin: const EdgeInsets.all(0.0),
                          builder: SwiperCustomPagination(builder:
                              (BuildContext context,
                              SwiperPluginConfig config) {
                            return ConstrainedBox(
                              constraints: BoxConstraints.expand(
                                  height: DoScreenAdapter.h(15)), //隔底部的间距
                              child: Row(
                                children: <Widget>[
                                  Expanded(
                                    child: Align(
                                      alignment: Alignment.center,
                                      child: const RectSwiperPaginationBuilder(
                                        color: Colors.black12,
                                        activeColor: Colors.white,
                                      ).build(context, config),
                                    ),
                                  )
                                ],
                              ),
                            );
                          })),
                      itemBuilder: (context, index) {
                        return Image.network(
                          DoNetwork.replacePictureURL(
                              controller.bestBannerList[index].pic!),
                          fit: BoxFit.fill,
                        );
                      },
                    ),
                  ),
                ),
              ),
              SizedBox(
                width: DoScreenAdapter.w(10),
              ),
              //右侧
              Expanded(
                flex: 1,
                child: Obx(
                      () => Column(
                    children:
                    controller.hotGoodsList.asMap().entries.map((entries) {
                      var element = entries.value;
                      return Expanded(
                          flex: 1,
                          child: Container(
                            margin: EdgeInsets.fromLTRB(0, 0, 0,
                                entries.key == 2 ? 0 : DoScreenAdapter.h(5)),
                            padding: EdgeInsets.fromLTRB(
                                DoScreenAdapter.w(10),
                                DoScreenAdapter.h(0),
                                DoScreenAdapter.w(0),
                                DoScreenAdapter.h(0)),
                            decoration: BoxDecoration(
                              borderRadius:
                              BorderRadius.circular(DoScreenAdapter.w(5)),
                              color: DoColors.gray249,
                            ),
                            child: Row(
                              children: [
                                Expanded(
                                  flex: 3,
                                  child: Column(
                                    mainAxisAlignment: MainAxisAlignment.center,
                                    crossAxisAlignment:
                                    CrossAxisAlignment.start,
                                    children: [
                                      Text(
                                        "${element.title}",
                                        style: const TextStyle(
                                            fontSize: 12,
                                            fontWeight: FontWeight.bold),
                                      ),
                                      SizedBox(
                                        height: DoScreenAdapter.h(5),
                                      ),
                                      Text("${element.subTitle}",
                                          style: const TextStyle(
                                            fontSize: 10,
                                          )),
                                      SizedBox(
                                        height: DoScreenAdapter.h(5),
                                      ),
                                      Text("¥${element.price}",
                                          style: const TextStyle(
                                              fontSize: 10,
                                              color: Colors.black54,
                                              fontWeight: FontWeight.bold)),
                                    ],
                                  ),
                                ),
                                Expanded(
                                  flex: 2,
                                  child: Image.network(
                                    DoNetwork.replacePictureURL(element.pic!),
                                    fit: BoxFit.cover,
                                  ),
                                ),
                              ],
                            ),
                          ));
                    }).toList(),
                  ),
                ),
              )
            ],
          ),
        ),
      ],
    );
  }

  ///瀑布流列表
  Widget _goodsListView() {
    return Column(
      children: [
        Container(
          color: Colors.white,
          padding: EdgeInsets.all(DoScreenAdapter.w(10)),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: const [
              Text(
                "省心优惠",
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
              ),
              Text(
                "全部优惠 ＞",
                style: TextStyle(
                    fontSize: 12,
                    // fontWeight: FontWeight.bold,
                    color: Colors.black38),
              ),
            ],
          ),
        ),
        Obx(() => Container(
          color: DoColors.gray249,
          child: MasonryGridView.count(
            padding: EdgeInsets.all(DoScreenAdapter.w(10)),
            crossAxisCount: 2,
            mainAxisSpacing: DoScreenAdapter.w(10), //垂直间距
            crossAxisSpacing: DoScreenAdapter.h(8), //水平间距
            itemCount: controller.goodsList.length,
            shrinkWrap: true, //收缩，让子元素自适应宽度
            physics:
            const NeverScrollableScrollPhysics(), //禁止自身滚动，让外面的listView滚动
            itemBuilder: (context, index) {
              return InkWell(
                onTap: () {
                  Get.toNamed("/goods-content", arguments: {
                    "sid": controller.goodsList[index].sId,
                    "isCanJumpCart": true,
                  });
                },
                child: Container(
                  decoration: BoxDecoration(
                    borderRadius:
                    BorderRadius.circular(DoScreenAdapter.w(5)),
                    color: Colors.white,
                  ),
                  child: Column(
                    children: [
                      Container(
                        //这个是为了测试设置图片上左，上右的圆角而设置的，暂时不能完美实现，如下注释
                        // height: DoScreenAdapter.h(40),
                        padding: EdgeInsets.all(DoScreenAdapter.w(5)),
                        // decoration: BoxDecoration(
                        //如果要如下设置上左，上右的圆角，必须要有container的height，
                        //但是这样，就不能让图片自适应了，或者计算，或者网络直接返回图片的高
                        // borderRadius: BorderRadius.only(
                        //     topLeft:
                        //         Radius.circular(DoScreenAdapter.w(5)),
                        //     topRight:
                        //         Radius.circular(DoScreenAdapter.w(5))),
                        // image: DecorationImage(
                        //     image: NetworkImage(
                        //         DoNetwork.replacePictureURL(
                        //             controller.goodsList[index].pic!)),
                        //     fit: BoxFit.cover),
                        // ),
                        ///若有特殊圆角需求，可以用上面的DecorationImage，但是各条件要满足，否则直接用child自适应
                        child: Image.network(
                          DoNetwork.replacePictureURL(
                              controller.goodsList[index].pic!),
                          fit: BoxFit.cover,
                        ),
                      ),
                      Container(
                        padding: EdgeInsets.fromLTRB(
                            DoScreenAdapter.w(10),
                            DoScreenAdapter.h(0),
                            DoScreenAdapter.w(10),
                            DoScreenAdapter.h(5)),
                        alignment: Alignment.centerLeft,
                        child: Text(
                          "${controller.goodsList[index].title}",
                          style: TextStyle(
                              fontSize: DoScreenAdapter.fs(14),
                              fontWeight: FontWeight.bold),
                        ),
                      ),
                      Container(
                        padding: EdgeInsets.symmetric(
                            horizontal: DoScreenAdapter.w(10)),
                        alignment: Alignment.centerLeft,
                        child: Text(
                          "${controller.goodsList[index].subTitle}",
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                          style: TextStyle(
                            color: Colors.black26,
                            fontSize: DoScreenAdapter.fs(12),
                          ),
                        ),
                      ),
                      Container(
                        padding: EdgeInsets.fromLTRB(
                            DoScreenAdapter.w(10),
                            DoScreenAdapter.h(15),
                            DoScreenAdapter.w(10),
                            DoScreenAdapter.h(10)),
                        alignment: Alignment.centerLeft,
                        child: Text(
                          "¥${controller.goodsList[index].price}",
                          style: TextStyle(
                              fontSize: DoScreenAdapter.fs(14),
                              fontWeight: FontWeight.bold),
                        ),
                      ),
                    ],
                  ),
                ),
              );
            },
          ),
        )),
      ],
    );
  }
}
